Aromatic amines are weakly basic, whereas the below given compound is strongly basic, explain this unusual behaviour. View Solution Consider the Hofmann ammonolysis reaction : R−X+..NH3→HX+RNH21∘amineR−X−−→373K IfR=Me3C−(t−butyl), the correct order of basic character of...
In order to determine the character of the behavior of amines (bases/nucleophiles) in this reaction, their reactivity has been analyzed within the conceptions of basic and nucleophilic mechanisms of catalysis. Based on the quantitative amine structure鈥攃atalytic activity correlation, it has been ...
Changes in the hybrid state of atomic orbitals of nitrogen and p-character of LEP, which occur under the effect of saturated hydrocarbon radicals and polar substituents in aliphatic amines, differ substantially. Therefore, the effect of the both substituents on the basicity constants of amines cannot...
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CD spectra recorded in the far-UV region provide useful data to assess the secondary structure of proteins and peptides. Spectra were collected for eleven peptides sharing a basic amphipathic character, and for a control peptide bearing several negatively charged residues (Table 1, Fig. 1). Most...
In such reactions care must likewise be taken that the final products still retain basic character. The number of compounds of this type is very large. The following instances may be mentioned without any claim to completeness: oxamide, nitrogenous derivatives of carbonic and thiocarbonic acids ...
Oxidation of 2-ethyl-5,6,7,8-tetrahydro-9,10-anthrahydroquinone (ETHAHQ) by oxygen in a stirred reactor was studied. It was found that substances of basic character (organic amines, basic heterogeneous catalysts) could successfully catalyze this oxidation. Linear dependence of the oxidation rate...
this invention relates to the use of dyeing baths based on preferably chlorinated organic solvents, containing salts or complexes of organic dyes, containing carboxylic and/or sulphonic groups, with aliphatic amines of a selective liquid anion-exchanger character wherein a primary or secondary nitrogen...
Pivotal Role of the Basic Character of Organic and Salt Catalysts in CN Bond Forming Reactions of Amines with CO2C1-SynthonKohlendioxidOrganische SyntheseOrganokatalyseNachhaltige ChemieOrganocatalysts promote a range of C㎞ bond forming reactions of amines with CO2. Herein, we review these reactions...
Pivotal Role of the Basic Character of Organic and Salt Catalysts in CN Bond Forming Reactions of Amines with CO2C1 synthoncarbon dioxideorganic synthesisorganocatalysissustainable chemistryOrganocatalysts promote a range of C㎞ bond forming reactions of amines with CO2. Herein, we review these ...